Attachment for radio sets



Feb. 21, 1950 B. SINGER 2,497,963

ATTACHMENT FOR RADIO SETS Filed Jan. 2, 1947 INVENTOR. BENJAMIN SINGERPatented Feb. 21, 1950 ATTACHMENT FOR RADIO SETS Benjamin Singer,Brooklyn,

N. Y., assignor to Teletone Radio Corporation, New York, N. Y., acorporation of New York Application January 2, 1947, Serial No. 719,685

8 Claims.

This invention relates to an attachment for radio receiving sets whichis disposed in a predetermined relation to the tubes and other parts ofthe set (in a manner fully described in the specification) for thepurpose of bettering the performance and serviceability of such sets inthe respects which will be more fully enumerated in the ensuingstatement of the objects of the invention, and further amplified in thebody of the specification.

The attachment is particularly adapted for radio setscontaining low-heatemciency tubes. In such sets it is important for the proper operatlonofthe low-heat tubes to dissipate the filament heat away from the tube,especially its upper portion, at which region the heat naturally tendsto concentrate because of upward convective flow and the presence thereof the heat generating surfaces.

Accordingly, one of the objects of this invention is to provide anattachment, which is inexpensive and readily secured in place in theradio set, for conducting away the heat from the tubes thereof,particularly from their upper region.

allied object is a unitary means for reducing tube temperature.

L Another object of the invention is an attachment for a radio receivingset which will provide, or serve as, electrostatic shields for theindividual tubes. v I

A further object is an attachment for holding the tubes in place intheir sockets, especially when subjected to movement or shock,particularly in the case of portable radio sets. An allied object is aunitary attachment for radio sets which will secure the tubes againstdamage during shipment.

. For the attainment of the foregoing and such other objects as mayappear or be pointed out herein, I have shown one embodiment of myinvention in the accompanying drawing, wherein: Figfl is a front View ofthe chassis of a small radio receiving set, showing the improvedattachment in. place;

:','Fig. 2 is an end view of the radio set and attachment of Fig. 1;

Fig. 3 is a top view of the radio chassis;

Fig. 4 is a bottom view of the improved attachment; and

Fig. 5 isa detail showing the s'ecurement of 'the helical-spiral springto the plate of the attachment.

f The chassis of a small radio receiving set is shown in Figs. 1-3; itcomprises a raised base H formed !rom"'plate material to present a frontof sockets l8 for receiving radio tubes I1, and

the container for an intermediate-frequency transformer unit 18. Thevariable condenser is not shown, but this would be placed on the base H,i. e., raised floor l3 thereof, in the space provided to the right, Fig.1, of the tubes. The chassis is fitted in the radio cabinet, representedin dot-and-dash lines and designated 9, and secured to the floor thereofby screws 01' the like passed through lip flange I9 projecting forwardlyof front panel 12.

The improved attachment comprises a plate 20 of suitable metal or alloy(as will be more fully considered herein). Plate 20 is of suflicientlength, Fig. 1, and width, Fig. 2, to overlie the tops of all five tubes11 and the top of the container for an intermediate-frequencytransformer unit [8. Plate 20 may be rectangular but as shown in thefigures, see particularly Fig. 4, it is made generally rectangularhaving a large cut out 2|, and a wide left side 22, Fig. 4, and anarrower right side from which uprises a lateral flange 23, more fullyconsidered subsequently. This configuration, and also size, of plate 20,is dictated by the positional arrangement of the tubes and will, ofcourse, vary in different radio sets. In any event, the size andconfiguration of plate 20 is such that it overlies all the tubes.

Attachment plate 28 may be secured in any suitable manner, but I preferto attach it to the top surface 18 of the container for anintermediate-frequency transformer unit I8, which is commonly formedwith a central bump I8 For this purpose, a threaded bolt 8 is passedthrough a central aperture in top bum W with its head 1 in underlyingrelation' to the shaped plate forming the can bump. Attachment plate 20has a raised (depressed as viewed in Fig. 4) portion 28 corresponding tobump 18 positioned to properly locate the plate relative to the radiotubes, the bump I8 resting within raised portion 28, as best shown inFig. 1. Depressed portion 28 is provided with openings 28', see Fig. 4,corresponding to the vent openings l8a at the top of the container foran intermediate-frequency transformer unit, see Fig. 3, and a centralaperture 21, Fig. 4, through which passes the bolt 8. The latter issecured in upright position by means of a nut 6 disposed at the surfaceof can bump l8 see Fig. 1. To more firmly hold the plate against turningrelatively to the container I8, plate 20 has a longitudinal, downwardlyturned,

(left portion,Fig. l) and to the top edge of lateral flange 233(rightportion Fig. 1); It is thus seen that the rear edge of lateral flange 23also serves as an abutment for back-board l, which is secured by screws(not shown) to base H of the chassis.

Located on plate 20 and spaced. corresponding to the tubes I?! are aplurality of spring elements 38 held in suspended relation to theunderside of the plate. The spring element 33 is what might be termedhelico-spiral in that the lowermost portion 33, see Fig. 2, is trulyhelical while the intermediate ortion 32' is spiraled outwardly from acentral point or" 'securement 3|. The. detailsof the spring securementisshown inFig. 5 where itwill be seen that thespiral portion. 32 of thespringis brought to a small, centrally disposedringt i, andthat theplate 20. has-an. aperture 25. A. rivet 25 or other fastening means ispassed through plate aperture 25 and spring ring 34, and headed over tosecure'thespring in place.

The insidediameter of the helical portion 33 of the springs is somewhat.larger than the outside diameter of the'radio'tubes H, so that thespringsa're: snugly fitted over the top portion of the tubes. The heightof lateral flange- 23 of the: attachment plate-2t is such that, when theattachment is properly secured to-the top of container It, with theradio tubes nested within'the suspended: springs 38, and the. chassistogether with the attachment placed within: radio cabinet 9', asinFig.2, the top edge of lateral flange. '23

disposed at short: dlstance below the top wall 9 of the cabinet.

Theattachment plate 28 is' fabricated of a metal or alloy having a highindex of heat con-- ductivity and of high electrical conducting value.The-spring elements BWarelikewisefabricated of a metal of similarproperties in addition to that of resiliency. The heat generated by thefilament of the tubes-and concentrated at the upper 'portion of thetubes is conducted by'thespring elements to the-plate 2b which, becauseof its considerable surface area, is effective todissipate-the heat, andthis to very considerably lower the temperature thereof. Additionally,the plate 2-0 is indirect contact with the-container l8 sothat the heatis conducted thereto and'vi'a the metal surface of the container tothemetallic base H, so that the heat receiving capacity of the base and'itslarge radiating, surface thereof both contribute in rapid dissipation ofthe filament heat.

The metallic spring; elements 3 1i also function as'elect'rostaticshields to carry away anyelectro'static charges on the tube surface,"via the plate 20, container il'and base H. v

The spring elements fit snugly'about'the' tubes and thus maintainthem-in upright position. The inwardly spiraled portion 3'2 of thespring elements is disposedimmediately abovethe rounded top. l'l', Fig;2, of the tubesso that any upward movement of the tubes from theirsockets is re.- siSted by the springs which, moreover, by, reason oftheir resiliency, serve as cushions, to takeup any shock or impact towhich the tubes themselves might be subjected to.

I claim:

1. An attachment for radio receiving sets hav ing a cabinet housing achassis upon the base of which are mounted the radio tubes and containerfor an intermediate-frequency transformer unit the latter being of thetype having an apertured top bump, said attachment com: prising-ametallic. plate dimensioned and configurated to.- overlie allv of saidtubes and container and having a raised portion shaped and located toreceive the said top bump of the container, said raised portion havingopenings align able with the said apertures of the bump and a centralaperture, a threaded bolt passing through the center of the said bump,with its head there- Within, and through said plate aperture, a nutlocking the bolt in upright position, a wing nut for securing theattachment plate in place, said attachment plate having a dependingflange along a longitudinal edge abuttable with the side of thecontainer and an uprising flange at a transverse edge underlying the topWall of said cabinet, a plurality of helico-spiral springs haying'aspiraled portion tapering outwardly from the, center axis of the springand a helical portion of aninternal diameter somewhat greater than'the'tube diameter, one end oisaid' spring being coiled to present a smallring at said center axis, and rivets-:en-e gaged through said springrings tosecure the springs in suspendedrelation-to the attachment plate,said springs being located on: the plateat points alignedwith the tubes,the upperportions thereof being snugly receivedin the helical portionsof the springs with the rounded ends thereof within the saidspiraledportions j of the springs.

2. An attachment for radio receiving Serenaing a cabinet housinga-chassis upon which are mounted the radio tubes and container foranintermediate-frequency transformer unit; the latter being of the typehaving a topbump; said attachment comprising a metallic platedimensionedand configurated to overlie all of Saidtubes and container andhaving araised portion shaped a and, located to receive the said top'bumpof thecontainer, a threaded bolt passing through the center of the said bump,with its head therewithin, and through said plate, a nut for securingthe attachment plate in place, said attachment plate having an uprisingflange at atransverse edge underlying the top wall of said cabinet-aplurality of helico-spiral springs having a 'spiraled portion taperingoutwardly from the center axis of the spring and a helical portion ofarr-internal diameter somewhat greater than the tube diameter,and'rivets engaging one 'endof said spring rings to secure the springsin suspended relation to the attachment plate, saidsprings-being-located on the plate at points alignedwith the tubes, theupper portions thereof being snugly received in the helical portions or.the springs with the rounded ends thereof within the saidspiraledportions of the springs. v I

3. An attachment for radio receiving setshayfing a chassis upon whichare mounted" th'eradio tubes and container for an, intermediate frequency transformer unit, said. attachment'jcomprising a metallic platedimensioned andconfigurated'to overlie all of said tubes and'contfainerand having an aperture, a threaded "bolt passing through the top of thecontainer with its head therewithin and through said plate, aperture, anutter securing the attachment plate. in place, said, attachment platehavingaidepend'ing 15 flange alonga longitudinal edgeabuttablelwith theside of the container, a plurality of helicospiral springs having aspiraled portion tapering outwardly from the center axis of the springand a helical portion of an internal diameter somewhat greater than thetube diameter, said springs being secured in suspended relation to theattachment plate, at points aligned with the tubes, the upper portionsthereof being snugly received in the helical portions of the springswith the rounded ends thereof within the said spiraled portions of thesprings.

4. An attachment for radio receiving sets having a cabinet housing achassis upon which are mounted the radio tubes and container for anintermediate-frequency transformer unit, said attachment comprising ametallic plate dimensioned and configurated to overlie all of said tubesand container and secured to the top of the container, said attachmentplate having a depending flange ble with the side of the container andan uprising flange at a transverse edge underlying the top wall of saidcabinet, a plurality of helico-spiral springs having a spiraled portiontapering outwardly from the center axis of the spring and a helicalportion of an internal diameter somewhat greater than the tube diameter,said springs being secured in suspended relation to the attachment plateat points aligned with the tubes, the upper portions thereof beingsnugly received in the helical portions of the springs with the roundedends thereof within the said spiraled portions of the springs.

5. An attachment for radio receiving sets having a chassis upon whichare mounted the radio tubes and container for an intermediate-frequencytransformer unit, said attachment comprising a metallic platedimensioned and configurated to overlie all of said tubes and containerand secured to the top of the container, a plurality of helico-spiralsprings having a spiraled portion tapering outwardly from the centeraxis of the spring and a helical portion of an internal diametersomewhat greater than the tube diameter, said springs being secured insuspended relation to the attachment plate at points aligned with thetubes, the upper portions thereof being snugly received in the helicalportions of the springs With the rounded ends thereof within the saidspiraled portions of the springs.

6. An attachment for radio receiving sets having a cabinet housing achassis upon which are mounted the radio tubes and container 'for anintermediate-frequency transformer unit, said attachment comprising ametallic plate dimensioned and configurated to overlie all of said tubesand container and secured to the top of the container, said attachmentplate having 8. depending along a longitudinal edge abuttaflange along alongitudinal edge abuttable with the side of the can and an uprisingflange at a transverse edge underlying the top wall of said cabinet, anda plurality of helico-spiral springs secured to the underside of theplate in encircling relation to the said tubes.

7. An attachment for radio receiving sets having a cabinet housing achassis upon which are mounted the radio tubes and container for anintermediate-frequency transformer unit, said attachment comprising ametallic plate dimensioned and configurated to overlie all of said tubesand container and secured to the top of the container, said attachmentplate having a depending flange along a longitudinal edge abuttable withthe side of the container and an uprising flange at a transverse edgeunderlying the top wall of said cabinet, and a plurality of springssecured to the underside of the plate in encircling relation to the saidtubes.

8. An attachment for radio receiving sets having a cabinet open at therear and housing a chassis upon the base of which is mounted the radiotubes and container for an intermediatefrequency transformer unit and abackboard for closing the rear opening of the cabinet, said attachmentcomprising a metallic plate dimensioned and configurated to overlie allof said tubes and container and secured to the top of the container,said attachment plate having a depending flange along a longitudinaledge abuttable with the side of the container and an uprising flange ata transverse edge, said backboard being secured to said chassis basewith the major portion of its upper edge aligned with the attachmentplate, the remaining portion being aligned with the top of said lateralflange of the attachment plate, said longitudinal flange and the rearedge of said transverse flange of the atltlachment plate serving asabutment for the backoard.

BENJANIIN SINGER.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,587,120 Haddock June 1, 19261,816,718 Bond July 28, 1931 2,441,234 Dillon May 11, 1948 FOREIGNPATENTS Number Country Date 311,704 Great Britain Feb. 13, 1930 334,861Great Britain Sept. 8, 1930

